diff --git a/manifests/params.pp b/manifests/params.pp
index 18b0c1e..4db2890 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -651,6 +651,8 @@
 #   particular item.
 # @param  [string] ng_user_arg1 the user argument for $user1$
 # @param  [string] ng_user_arg2 the user argument for $user2$
+# @param  [array] reqpackages_server the packages for the server
+# @param  [array] reqpackages_client the packages for the clients
 ###############################################################################
 class cd_nagios::params (
 
@@ -906,21 +908,15 @@ $ng_loadctl_options         = 'jobs_max=100;backoff_limit=10;rampup_change=5',
 # single nagios checks
 $ng_enable_swap_check       = true,
 
-
-) {
-
-# installation section
-
-  $reqpackages_server = $::operatingsystem ? {
-    /(?i-mx:centos|fedora|redhat)/ => ['nagios','nagios-devel']
-  }
-  $reqpackages_client = $::operatingsystem ? {
-    /(?i-mx:centos|fedora|redhat)/ => ['net-snmp-utils',
+# installation
+$reqpackages_server         = ['nagios','nagios-devel'],
+$reqpackages_client         = ['net-snmp-utils',
                                         'nagios-plugins',
                                         'nagios-plugins-all',
                                         'nagios-plugins-nrpe',
-                                        'nagios-common']
-  }
+                                        'nagios-common'],
+
+) {
 
 # service
 $ng_service                 = 'nagios'